<template>
  <!-- 表格主体 -->
  <div class="card table-main">
    <!-- 表格头部 操作按钮 -->
    <div class="table-header">
      <div class="header-button-lf">
        <slot name="tableHeader" :selected-list="selectedList" :selected-list-ids="selectedListIds" :is-selected="isSelected" />
      </div>
      <div v-if="toolButton" class="header-button-ri">
        <slot name="toolButton">
          <slot name="searchInput">
            <!--<Search :search="_search" :reset="_reset" :props="searchProps" :search-param="searchParam" />-->
            <el-form inline>
              <template v-for="(item, index) in exportSearch" :key="index">
                <el-form-item :label="item.label" style="margin-right: var(--margin-default); margin-bottom: 0">
                  <!--<el-input style="width: 200px" v-model="searchParam.keyword" placeholder="请输入内容" clearable />-->
                  <component
                    style="width: 180px"
                    :is="`el-${item.search}`"
                    v-model="searchParam[item.fieldNames?.value ?? item.prop]"
                    @focus="handleFocus(item)"
                    clearable
                    filterable
                    v-bind="{ ...item.props }"
                  >
                    <template v-if="item.search === 'select'">
                      <component
                        :is="`el-option`"
                        v-for="(col, index1) in item.enum"
                        :key="index1"
                        :label="col[col.label]"
                        :value="col[col.value]"
                      />
                    </template>
                  </component>
                </el-form-item>
              </template>
              <el-dropdown v-if="hideSearch.length" trigger="click" placement="bottom" :hide-on-click="false">
                <el-button :icon="Filter" text />
                <template #dropdown>
                  <div style="padding: 20px 10px">
                    <template v-for="(item, index) in hideSearch" :key="index">
                      <el-form-item
                        :label="item.label"
                        label-width="95"
                        style="margin-right: var(--margin-default); margin-bottom: 5px"
                      >
                        <!--<el-input style="width: 200px" v-model="searchParam.keyword" placeholder="请输入内容" clearable />-->
                        <component
                          style="width: 180px"
                          :is="`el-${item.search}`"
                          v-model="searchParam[item.fieldNames?.value ?? item.prop]"
                          clearable
                          filterable
                          v-bind="{ ...item.props }"
                        >
                          <template v-if="item.search === 'select'">
                            <component
                              :is="`el-option`"
                              v-for="col in item.enum"
                              :key="col"
                              :label="col.label"
                              :value="col.value"
                            />
                          </template>
                        </component>
                      </el-form-item>
                    </template>
                  </div>
                </template>
              </el-dropdown>
            </el-form>
            <el-button v-if="exportSearch.length" :icon="Search" text @click="search" />
            <el-button :icon="Refresh" text @click="reset" />
          </slot>
          <el-button v-if="showToolButton('setting') && columns.length" text :icon="Setting" @click="openColSetting" />
          <!--<el-button
            v-if="showToolButton('search') && searchColumns?.length"
            :icon="Search"
            circle
            @click="isShowSearch = !isShowSearch"
          />-->
        </slot>
      </div>
    </div>
    <!-- 表格主体 -->
    <el-table
      ref="tableRef"
      v-bind="$attrs"
      :id="uuid"
      :data="processTableData"
      :border="border"
      :row-key="rowKey"
      @selection-change="selectionChange"
    >
      <!-- 默认插槽 -->
      <slot />
      <template v-for="item in tableColumns" :key="item">
        <!-- selection || radio || index || expand || sort -->
        <el-table-column
          v-if="item.type && columnTypes.includes(item.type)"
          v-bind="item"
          :align="item.align ?? 'center'"
          :reserve-selection="item.type == 'selection'"
        >
          <template #default="scope">
            <!-- expand -->
            <template v-if="item.type == 'expand'">
              <component :is="item.render" v-bind="scope" v-if="item.render" />
              <slot v-else :name="item.type" v-bind="scope" />
            </template>
            <!-- radio -->
            <el-radio v-if="item.type == 'radio'" v-model="radio" :label="scope.row[rowKey]">
              <i></i>
            </el-radio>
            <!-- sort -->
            <el-tag v-if="item.type == 'sort'" class="move">
              <el-icon> <DCaret /></el-icon>
            </el-tag>
          </template>
        </el-table-column>
        <!-- other -->
        <TableColumn v-else :column="item">
          <template v-for="slot in Object.keys($slots)" #[slot]="scope">
            <slot :name="slot" v-bind="scope" />
          </template>
        </TableColumn>
      </template>
      <!-- 插入表格最后一行之后的插槽 -->
      <template #append>
        <slot name="append" />
      </template>
      <!-- 无数据 -->
      <template #empty>
        <div class="table-empty">
          <slot name="empty">
            <img src="@/assets/images/notData.png" alt="notData" />
            <div>暂无数据</div>
          </slot>
        </div>
      </template>
    </el-table>
    <!-- 分页组件 -->
    <slot name="pagination">
      <Pagination
        v-if="pagination"
        :pageable="pageable"
        :handle-size-change="handleSizeChange"
        :handle-current-change="handleCurrentChange"
      />
    </slot>
  </div>
  <!-- 列设置 -->
  <ColSetting v-if="toolButton" ref="colRef" v-model:col-setting="colSetting" />
</template>

<script setup lang="ts" name="ProTable">
import { ref, watch, provide, onMounted, unref, computed, reactive } from 'vue'
import { ElTable } from 'element-plus'
import { useTable } from '@/hooks/useTable'
import { useSelection } from '@/hooks/useSelection'
import { BreakPoint } from '@/components/Grid/interface'
import { ColumnProps, TypeProps } from '@/components/ProTable/interface'
import { Refresh, Operation, Search, Setting, Filter, DCaret } from '@element-plus/icons-vue'
import { generateUUID, handleProp } from '@/utils'
import SearchForm from '@/components/SearchForm/index.vue'
import Pagination from './components/Pagination.vue'
import ColSetting from './components/ColSetting.vue'
import TableColumn from './components/TableColumn.vue'
import Sortable from 'sortablejs'

export interface ProTableProps {
  searchProps?: any[]
  columns: ColumnProps[] // 列配置项  ==> 必传
  data?: any[] // 静态 table data 数据，若存在则不会使用 requestApi 返回的 data ==> 非必传
  requestApi?: (params: any) => Promise<any> // 请求表格数据的 api ==> 非必传
  requestAuto?: boolean // 是否自动执行请求 api ==> 非必传（默认为true）
  requestError?: (params: any) => void // 表格 api 请求错误监听 ==> 非必传
  dataCallback?: (data: any) => any // 返回数据的回调函数，可以对数据进行处理 ==> 非必传
  title?: string // 表格标题 ==> 非必传
  pagination?: boolean // 是否需要分页组件 ==> 非必传（默认为true）
  initParam?: any // 初始化请求参数 ==> 非必传（默认为{}）
  border?: boolean // 是否带有纵向边框 ==> 非必传（默认为true）
  toolButton?: ('refresh' | 'setting' | 'search')[] | boolean // 是否显示表格功能按钮 ==> 非必传（默认为true）
  rowKey?: string // 行数据的 Key，用来优化 Table 的渲染，当表格数据多选时，所指定的 id ==> 非必传（默认为 id）
  searchCol?: number | Record<BreakPoint, number> // 表格搜索项 每列占比配置 ==> 非必传 { xs: 1, sm: 2, md: 2, lg: 3, xl: 4 }
}

// 接受父组件参数，配置默认值
const props = withDefaults(defineProps<ProTableProps>(), {
  columns: () => [],
  requestAuto: true,
  pagination: true,
  initParam: {},
  border: true,
  toolButton: true,
  rowKey: 'id',
  searchCol: () => ({ xs: 1, sm: 2, md: 2, lg: 3, xl: 4 })
})

// 暴露出来的搜索框
const exportSearch = computed(() => {
  let search = props.searchProps?.slice(0, 3) ?? []
  search.length &&
    (search = search.map(item => {
      !item.props && (item.props = {})
      switch (item.search) {
        case 'input':
          item.props.placeholder = '请输入'
          break
        case 'date-picker':
          if (['datetimerange', 'daterange', 'monthrange'].includes(item?.props?.type) || item?.props?.isRange) {
            item.props.rangeSeparator = '至'
            item.props.startPlaceholder = '开始时间'
            item.props.endPlaceholder = '结束时间'
          }
          break
        case 'select':
          item.props.placeholder = '请选择'
        /*if (Array.isArray(item.enum)) {
            item.enum = item.enum.map(op => {
              return {
                ...op,
                label: item.fieldNames?.label ?? 'label',
                value: item.fieldNames?.value ?? 'value'
              }
            })
          } else if (typeof item.enum.then === 'function') {
            item.enum.then((res: any) => {
              item.enum = res.data
            })
          }*/
      }
      return item
    }))
  return search
})
// 隐藏搜索框
const hideSearch = computed(() => {
  let search = props.searchProps?.slice(3) ?? []
  search.length &&
    (search = search.map(item => {
      !item.props && (item.props = {})
      switch (item.search) {
        case 'input':
          item.props.placeholder = '请输入'
          break
        case 'date-picker':
          if (['datetimerange', 'daterange', 'monthrange'].includes(item?.props?.type) || item?.props?.isRange) {
            item.props.rangeSeparator = '至'
            item.props.startPlaceholder = '开始时间'
            item.props.endPlaceholder = '结束时间'
          }
          break
        case 'select':
          item.props.placeholder = '请选择'
      }
      return item
    }))
  return search
})
// 搜索框获取焦点
const handleFocus = (item: any) => {
  if (item.search === 'select' && typeof item.handleFocus === 'function') {
    // 处理参数
    let params = item.params?.reduce((acc, cur) => {
      if (typeof cur === 'object') {
        for (let curKey in cur) {
          if (typeof cur[curKey] === 'object' && !Array.isArray(cur[curKey]) && searchParam.value[curKey]) {
            // curKey = createTime
            // cur[curKey] = {startTime: 0, endTime: 1}
            for (let curElementKey in cur[curKey]) {
              acc[curElementKey] = searchParam.value[curKey][cur[curKey][curElementKey]]
            }
          } else if (typeof cur[curKey] !== 'object' || Array.isArray(cur[curKey])) {
            acc[curKey] = cur[curKey]
          }
        }
      } else {
        searchParam.value[cur] && (acc[cur] = searchParam.value[cur])
      }
      return acc
    }, {})
    // 触发 api
    item.handleFocus(params).then((res: any) => {
      item.enum = res.data.map(op => {
        return {
          ...op,
          label: item.fieldNames?.label ?? 'label',
          value: item.fieldNames?.value ?? 'value'
        }
      })
    })
  } else if (item.search === 'select') {
    item.enum = item.enum.map(op => {
      return {
        ...op,
        label: item.fieldNames?.label ?? 'label',
        value: item.fieldNames?.value ?? 'value'
      }
    })
  }
}

// table 实例
const tableRef = ref<InstanceType<typeof ElTable>>()

// 生成组件唯一id
const uuid = ref('id-' + generateUUID())

// column 列类型
const columnTypes: TypeProps[] = ['selection', 'radio', 'index', 'expand', 'sort']

// 是否显示搜索模块
const isShowSearch = ref(true)

// 控制 ToolButton 显示
const showToolButton = (key: 'refresh' | 'setting' | 'search') => {
  return Array.isArray(props.toolButton) ? props.toolButton.includes(key) : props.toolButton
}

// 单选值
const radio = ref('')

// 表格多选 Hooks
const { selectionChange, selectedList, selectedListIds, isSelected } = useSelection(props.rowKey)

// 表格操作 Hooks
const { tableData, pageable, searchParam, searchInitParam, getTableList, search, reset, handleSizeChange, handleCurrentChange } =
  useTable(props.requestApi, props.initParam, props.pagination, props.dataCallback, props.requestError)

// 清空选中数据列表
const clearSelection = () => tableRef.value!.clearSelection()

// 初始化表格数据 && 拖拽排序
onMounted(() => {
  dragSort()
  props.requestAuto && getTableList()
  props.data && (pageable.value.total = props.data.length)
})

// 处理表格数据
const processTableData = computed(() => {
  if (!props.data) return tableData.value
  if (!props.pagination) return props.data
  return props.data.slice(
    (pageable.value.pageNum - 1) * pageable.value.pageSize,
    pageable.value.pageSize * pageable.value.pageNum
  )
})

// 监听页面 initParam 改化，重新获取表格数据
watch(() => props.initParam, getTableList, { deep: true })

// 接收 columns 并设置为响应式
const tableColumns = reactive<ColumnProps[]>(props.columns)

// 扁平化 columns
const flatColumns = computed(() => flatColumnsFunc(tableColumns))

// 定义 enumMap 存储 enum 值（避免异步请求无法格式化单元格内容 || 无法填充搜索下拉选择）
const enumMap = ref(new Map<string, { [key: string]: any }[]>())
const setEnumMap = async ({ prop, enum: enumValue }: ColumnProps) => {
  if (!enumValue) return

  // 如果当前 enumMap 存在相同的值 return
  if (enumMap.value.has(prop!) && (typeof enumValue === 'function' || enumMap.value.get(prop!) === enumValue)) return

  // 当前 enum 为静态数据，则直接存储到 enumMap
  if (typeof enumValue !== 'function') return enumMap.value.set(prop!, unref(enumValue!))

  // 为了防止接口执行慢，而存储慢，导致重复请求，所以预先存储为[]，接口返回后再二次存储
  enumMap.value.set(prop!, [])

  // 当前 enum 为后台数据需要请求数据，则调用该请求接口，并存储到 enumMap
  const { data } = await enumValue()
  enumMap.value.set(prop!, data)
}

// 注入 enumMap
provide('enumMap', enumMap)

// 扁平化 columns 的方法
const flatColumnsFunc = (columns: ColumnProps[], flatArr: ColumnProps[] = []) => {
  columns.forEach(async col => {
    if (col._children?.length) flatArr.push(...flatColumnsFunc(col._children))
    flatArr.push(col)

    // column 添加默认 isShow && isSetting && isFilterEnum 属性值
    col.isShow = col.isShow ?? true
    col.isSetting = col.isSetting ?? true
    col.isFilterEnum = col.isFilterEnum ?? true

    // 设置 enumMap
    await setEnumMap(col)
  })
  return flatArr.filter(item => !item._children?.length)
}

// 过滤需要搜索的配置项 && 排序
const searchColumns = computed(() => {
  return flatColumns.value
    ?.filter(item => item.search?.el || item.search?.render)
    .sort((a, b) => a.search!.order! - b.search!.order!)
})

// 设置 搜索表单默认排序 && 搜索表单项的默认值
searchColumns.value?.forEach((column, index) => {
  column.search!.order = column.search?.order ?? index + 2
  const key = column.search?.key ?? handleProp(column.prop!)
  const defaultValue = column.search?.defaultValue
  if (defaultValue !== undefined && defaultValue !== null) {
    searchParam.value[key] = defaultValue
    searchInitParam.value[key] = defaultValue
  }
})

// 列设置 ==> 需要过滤掉不需要设置的列
const colRef = ref()
const colSetting = tableColumns!.filter(item => {
  const { type, prop, isSetting } = item
  return !columnTypes.includes(type!) && prop !== 'operation' && isSetting
})
const openColSetting = () => colRef.value.openColSetting()

// 定义 emit 事件
const emit = defineEmits<{
  search: []
  reset: []
  dragSort: [{ newIndex?: number; oldIndex?: number }]
}>()

const _search = () => {
  search()
  emit('search')
}

const _reset = () => {
  reset()
  emit('reset')
}

// 表格拖拽排序
const dragSort = () => {
  const tbody = document.querySelector(`#${uuid.value} tbody`) as HTMLElement
  Sortable.create(tbody, {
    handle: '.move',
    animation: 300,
    onEnd({ newIndex, oldIndex }) {
      const [removedItem] = processTableData.value.splice(oldIndex!, 1)
      processTableData.value.splice(newIndex!, 0, removedItem)
      emit('dragSort', { newIndex, oldIndex })
    }
  })
}

// 暴露给父组件的参数和方法 (外部需要什么，都可以从这里暴露出去)
defineExpose({
  element: tableRef,
  tableData: processTableData,
  radio,
  pageable,
  searchParam,
  searchInitParam,
  isSelected,
  selectedList,
  selectedListIds,

  // 下面为 function
  getTableList,
  search,
  reset,
  handleSizeChange,
  handleCurrentChange,
  clearSelection,
  enumMap
})
</script>
